The first reel appears to be R3, ending with a title that says "Farther Faster Safer with Pennzoil."
A senior salesman or manager advises a younger salesman, both sitting in an office, about shop procedure, sales techniques and sales aids.
Second reel: nice shots of 1930s cars driving along urban streets (Detroit?)
Middle-class family sitting in living room reading
VS Cars drive into Pennzoil gas station, get oil checked and serviced
Third reel lacks sound.
Third reel: more driving scenes, winter, downtown street, etc.
In third reel, main and end titles appear together and it is revealed that two salespeople are sitting in a theatre talking after viewing a film.